/** 
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package com.tompai.common.util;

import java.awt.Image;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

/**
 * 图片通用类
 *
 * @author liinux@qq.com
 * @date 2019/10/3
 */
public class ImageHelper {
	/*
	 * 根据尺寸图片居中裁剪
	 */
	public static void cutCenterImage(String src, String dest, int w, int h) throws IOException {
		Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");
		ImageReader reader = (ImageReader) iterator.next();
		InputStream in = new FileInputStream(src);
		ImageInputStream iis = ImageIO.createImageInputStream(in);
		reader.setInput(iis, true);
		ImageReadParam param = reader.getDefaultReadParam();
		int imageIndex = 0;
		Rectangle rect = new Rectangle((reader.getWidth(imageIndex) - w) / 2, (reader.getHeight(imageIndex) - h) / 2, w,
				h);
		param.setSourceRegion(rect);
		BufferedImage bi = reader.read(0, param);
		ImageIO.write(bi, "jpg", new File(dest));

	}

	/*
	 * 图片裁剪二分之一
	 */
	public static void cutHalfImage(String src, String dest) throws IOException {
		Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");
		ImageReader reader = (ImageReader) iterator.next();
		InputStream in = new FileInputStream(src);
		ImageInputStream iis = ImageIO.createImageInputStream(in);
		reader.setInput(iis, true);
		ImageReadParam param = reader.getDefaultReadParam();
		int imageIndex = 0;
		int width = reader.getWidth(imageIndex) / 2;
		int height = reader.getHeight(imageIndex) / 2;
		Rectangle rect = new Rectangle(width / 2, height / 2, width, height);
		param.setSourceRegion(rect);
		BufferedImage bi = reader.read(0, param);
		ImageIO.write(bi, "jpg", new File(dest));
	}
	/*
	 * 图片裁剪通用接口-路径
	 */

	public static void cutImage(String src, String dest, int x, int y, int w, int h) throws IOException {
		Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");
		ImageReader reader = (ImageReader) iterator.next();
		InputStream in = new FileInputStream(src);
		ImageInputStream iis = ImageIO.createImageInputStream(in);
		reader.setInput(iis, true);
		ImageReadParam param = reader.getDefaultReadParam();
		Rectangle rect = new Rectangle(x, y, w, h);
		param.setSourceRegion(rect);
		BufferedImage bi = reader.read(0, param);
		ImageIO.write(bi, "jpg", new File(dest));

	}

	/*
	 * 图片裁剪通用接口-流
	 */

	public static void cutImageStream(FileInputStream src, String dest, int x, int y, int w, int h) throws IOException {
		Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");
		ImageReader reader = (ImageReader) iterator.next();
		InputStream in = src;
		ImageInputStream iis = ImageIO.createImageInputStream(in);
		reader.setInput(iis, true);
		ImageReadParam param = reader.getDefaultReadParam();
		Rectangle rect = new Rectangle(x, y, w, h);
		param.setSourceRegion(rect);
		BufferedImage bi = reader.read(0, param);
		ImageIO.write(bi, "jpg", new File(dest));

	}

	/*
	 * 图片缩放
	 */
	public static void zoomImage(String src, String dest, int w, int h) throws Exception {
		double wr = 0, hr = 0;
		File srcFile = new File(src);
		File destFile = new File(dest);
		BufferedImage bufImg = ImageIO.read(srcFile);
		Image Itemp = bufImg.getScaledInstance(w, h, bufImg.SCALE_SMOOTH);
		wr = w * 1.0 / bufImg.getWidth();
		hr = h * 1.0 / bufImg.getHeight();
		AffineTransformOp ato = new AffineTransformOp(AffineTransform.getScaleInstance(wr, hr), null);
		Itemp = ato.filter(bufImg, null);
		try {
			ImageIO.write((BufferedImage) Itemp, dest.substring(dest.lastIndexOf(".") + 1), destFile);
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}
}
